/*
 * Copyright 2007 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */
package im.composer.media.sound.synth;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.DoubleBuffer;
import java.nio.FloatBuffer;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioFormat.Encoding;

/**
 * This class is used to convert between 8,16,24,32,32+ bit signed/unsigned big/litle endian fixed/floating point byte buffers and float buffers.
 * 
 * @author Karl Helgason
 */
public abstract class AudioFloatConverter {

	public static final Encoding PCM_FLOAT = new Encoding("PCM_FLOAT");

	/***************************************************************************
	 * 
	 * LSB Filter, used filter least significant byte in samples arrays.
	 * 
	 * Is used filter out data in lsb byte when SampleSizeInBits is not dividable by 8.
	 * 
	 **************************************************************************/

	private static class AudioFloatLSBFilter extends AudioFloatConverter {

		private AudioFloatConverter converter;

		final private int offset;

		final private int stepsize;

		final private byte mask;

		private byte[] mask_buffer;

		public AudioFloatLSBFilter(AudioFloatConverter converter, AudioFormat format) {
			int bits = format.getSampleSizeInBits();
			boolean bigEndian = format.isBigEndian();
			this.converter = converter;
			stepsize = (bits + 7) / 8;
			offset = bigEndian ? (stepsize - 1) : 0;
			int lsb_bits = bits % 8;
			if (lsb_bits == 0)
				mask = (byte) 0x00;
			else if (lsb_bits == 1)
				mask = (byte) 0x80;
			else if (lsb_bits == 2)
				mask = (byte) 0xC0;
			else if (lsb_bits == 3)
				mask = (byte) 0xE0;
			else if (lsb_bits == 4)
				mask = (byte) 0xF0;
			else if (lsb_bits == 5)
				mask = (byte) 0xF8;
			else if (lsb_bits == 6)
				mask = (byte) 0xFC;
			else if (lsb_bits == 7)
				mask = (byte) 0xFE;
			else
				mask = (byte) 0xFF;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			byte[] ret = converter.toByteArray(in_buff, in_offset, in_len, out_buff, out_offset);

			int out_offset_end = in_len * stepsize;
			for (int i = out_offset + offset; i < out_offset_end; i += stepsize) {
				out_buff[i] = (byte) (out_buff[i] & mask);
			}

			return ret;
		}

		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			if (mask_buffer == null || mask_buffer.length < in_buff.length)
				mask_buffer = new byte[in_buff.length];
			System.arraycopy(in_buff, 0, mask_buffer, 0, in_buff.length);
			int in_offset_end = out_len * stepsize;
			for (int i = in_offset + offset; i < in_offset_end; i += stepsize) {
				mask_buffer[i] = (byte) (mask_buffer[i] & mask);
			}
			float[] ret = converter.toFloatArray(mask_buffer, in_offset, out_buff, out_offset, out_len);
			return ret;
		}

	}

	/***************************************************************************
	 * 
	 * 64 bit float, little/big-endian
	 * 
	 **************************************************************************/

	// PCM 64 bit float, little-endian
	private static class AudioFloatConversion64L extends AudioFloatConverter {
		ByteBuffer bytebuffer = null;

		DoubleBuffer floatbuffer = null;

		double[] double_buff = null;

		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int in_len = out_len * 8;
			if (bytebuffer == null || bytebuffer.capacity() < in_len) {
				bytebuffer = ByteBuffer.allocate(in_len).order(ByteOrder.LITTLE_ENDIAN);
				floatbuffer = bytebuffer.asDoubleBuffer();
			}
			bytebuffer.position(0);
			floatbuffer.position(0);
			bytebuffer.put(in_buff, in_offset, in_len);
			if (double_buff == null || double_buff.length < out_len + out_offset)
				double_buff = new double[out_len + out_offset];
			floatbuffer.get(double_buff, out_offset, out_len);
			int out_offset_end = out_offset + out_len;
			for (int i = out_offset; i < out_offset_end; i++) {
				out_buff[i] = (float) double_buff[i];
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int out_len = in_len * 8;
			if (bytebuffer == null || bytebuffer.capacity() < out_len) {
				bytebuffer = ByteBuffer.allocate(out_len).order(ByteOrder.LITTLE_ENDIAN);
				floatbuffer = bytebuffer.asDoubleBuffer();
			}
			floatbuffer.position(0);
			bytebuffer.position(0);
			if (double_buff == null || double_buff.length < in_offset + in_len)
				double_buff = new double[in_offset + in_len];
			int in_offset_end = in_offset + in_len;
			for (int i = in_offset; i < in_offset_end; i++) {
				double_buff[i] = in_buff[i];
			}
			floatbuffer.put(double_buff, in_offset, in_len);
			bytebuffer.get(out_buff, out_offset, out_len);
			return out_buff;
		}
	}

	// PCM 64 bit float, big-endian
	private static class AudioFloatConversion64B extends AudioFloatConverter {
		ByteBuffer bytebuffer = null;

		DoubleBuffer floatbuffer = null;

		double[] double_buff = null;

		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int in_len = out_len * 8;
			if (bytebuffer == null || bytebuffer.capacity() < in_len) {
				bytebuffer = ByteBuffer.allocate(in_len).order(ByteOrder.BIG_ENDIAN);
				floatbuffer = bytebuffer.asDoubleBuffer();
			}
			bytebuffer.position(0);
			floatbuffer.position(0);
			bytebuffer.put(in_buff, in_offset, in_len);
			if (double_buff == null || double_buff.length < out_len + out_offset)
				double_buff = new double[out_len + out_offset];
			floatbuffer.get(double_buff, out_offset, out_len);
			int out_offset_end = out_offset + out_len;
			for (int i = out_offset; i < out_offset_end; i++) {
				out_buff[i] = (float) double_buff[i];
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int out_len = in_len * 8;
			if (bytebuffer == null || bytebuffer.capacity() < out_len) {
				bytebuffer = ByteBuffer.allocate(out_len).order(ByteOrder.BIG_ENDIAN);
				floatbuffer = bytebuffer.asDoubleBuffer();
			}
			floatbuffer.position(0);
			bytebuffer.position(0);
			if (double_buff == null || double_buff.length < in_offset + in_len)
				double_buff = new double[in_offset + in_len];
			int in_offset_end = in_offset + in_len;
			for (int i = in_offset; i < in_offset_end; i++) {
				double_buff[i] = in_buff[i];
			}
			floatbuffer.put(double_buff, in_offset, in_len);
			bytebuffer.get(out_buff, out_offset, out_len);
			return out_buff;
		}
	}

	/***************************************************************************
	 * 
	 * 32 bit float, little/big-endian
	 * 
	 **************************************************************************/

	// PCM 32 bit float, little-endian
	private static class AudioFloatConversion32L extends AudioFloatConverter {
		ByteBuffer bytebuffer = null;

		FloatBuffer floatbuffer = null;

		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int in_len = out_len * 4;
			if (bytebuffer == null || bytebuffer.capacity() < in_len) {
				bytebuffer = ByteBuffer.allocate(in_len).order(ByteOrder.LITTLE_ENDIAN);
				floatbuffer = bytebuffer.asFloatBuffer();
			}
			bytebuffer.position(0);
			floatbuffer.position(0);
			bytebuffer.put(in_buff, in_offset, in_len);
			floatbuffer.get(out_buff, out_offset, out_len);
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int out_len = in_len * 4;
			if (bytebuffer == null || bytebuffer.capacity() < out_len) {
				bytebuffer = ByteBuffer.allocate(out_len).order(ByteOrder.LITTLE_ENDIAN);
				floatbuffer = bytebuffer.asFloatBuffer();
			}
			floatbuffer.position(0);
			bytebuffer.position(0);
			floatbuffer.put(in_buff, in_offset, in_len);
			bytebuffer.get(out_buff, out_offset, out_len);
			return out_buff;
		}
	}

	// PCM 32 bit float, big-endian
	private static class AudioFloatConversion32B extends AudioFloatConverter {
		ByteBuffer bytebuffer = null;

		FloatBuffer floatbuffer = null;

		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int in_len = out_len * 4;
			if (bytebuffer == null || bytebuffer.capacity() < in_len) {
				bytebuffer = ByteBuffer.allocate(in_len).order(ByteOrder.BIG_ENDIAN);
				floatbuffer = bytebuffer.asFloatBuffer();
			}
			bytebuffer.position(0);
			floatbuffer.position(0);
			bytebuffer.put(in_buff, in_offset, in_len);
			floatbuffer.get(out_buff, out_offset, out_len);
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int out_len = in_len * 4;
			if (bytebuffer == null || bytebuffer.capacity() < out_len) {
				bytebuffer = ByteBuffer.allocate(out_len).order(ByteOrder.BIG_ENDIAN);
				floatbuffer = bytebuffer.asFloatBuffer();
			}
			floatbuffer.position(0);
			bytebuffer.position(0);
			floatbuffer.put(in_buff, in_offset, in_len);
			bytebuffer.get(out_buff, out_offset, out_len);
			return out_buff;
		}
	}

	/***************************************************************************
	 * 
	 * 8 bit signed/unsigned
	 * 
	 **************************************************************************/

	// PCM 8 bit, signed
	private static class AudioFloatConversion8S extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++)
				out_buff[ox++] = in_buff[ix++] * (1.0f / 127.0f);
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++)
				out_buff[ox++] = (byte) (in_buff[ix++] * 127.0f);
			return out_buff;
		}
	}

	// PCM 8 bit, unsigned
	private static class AudioFloatConversion8U extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++)
				out_buff[ox++] = ((in_buff[ix++] & 0xFF) - 127) * (1.0f / 127.0f);
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++)
				out_buff[ox++] = (byte) (127 + in_buff[ix++] * 127.0f);
			return out_buff;
		}
	}

	/***************************************************************************
	 * 
	 * 16 bit signed/unsigned, little/big-endian
	 * 
	 **************************************************************************/

	// PCM 16 bit, signed, little-endian
	private static class AudioFloatConversion16SL extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int len = out_offset + out_len;
			for (int ox = out_offset; ox < len; ox++) {
				out_buff[ox] = ((short) ((in_buff[ix++] & 0xFF) | (in_buff[ix++] << 8))) * (1.0f / 32767.0f);
			}

			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ox = out_offset;
			int len = in_offset + in_len;
			for (int ix = in_offset; ix < len; ix++) {
				int x = (int) (in_buff[ix] * 32767.0);
				out_buff[ox++] = (byte) x;
				out_buff[ox++] = (byte) (x >>> 8);
			}
			return out_buff;
		}
	}

	// PCM 16 bit, signed, big-endian
	private static class AudioFloatConversion16SB extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				out_buff[ox++] = ((short) ((in_buff[ix++] << 8) | (in_buff[ix++] & 0xFF))) * (1.0f / 32767.0f);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * 32767.0);
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) x;
			}
			return out_buff;
		}
	}

	// PCM 16 bit, unsigned, little-endian
	private static class AudioFloatConversion16UL extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = (in_buff[ix++] & 0xFF) | ((in_buff[ix++] & 0xFF) << 8);
				out_buff[ox++] = (x - 32767) * (1.0f / 32767.0f);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = 32767 + (int) (in_buff[ix++] * 32767.0);
				out_buff[ox++] = (byte) x;
				out_buff[ox++] = (byte) (x >>> 8);
			}
			return out_buff;
		}
	}

	// PCM 16 bit, unsigned, big-endian
	private static class AudioFloatConversion16UB extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = ((in_buff[ix++] & 0xFF) << 8) | (in_buff[ix++] & 0xFF);
				out_buff[ox++] = (x - 32767) * (1.0f / 32767.0f);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = 32767 + (int) (in_buff[ix++] * 32767.0);
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) x;
			}
			return out_buff;
		}
	}

	/***************************************************************************
	 * 
	 * 24 bit signed/unsigned, little/big-endian
	 * 
	 **************************************************************************/

	// PCM 24 bit, signed, little-endian
	private static class AudioFloatConversion24SL extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = (in_buff[ix++] & 0xFF) | ((in_buff[ix++] & 0xFF) << 8) | ((in_buff[ix++] & 0xFF) << 16);
				if (x > 0x7FFFFF)
					x -= 0x1000000;
				out_buff[ox++] = x * (1.0f / (float) 0x7FFFFF);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * (float) 0x7FFFFF);
				if (x < 0)
					x += 0x1000000;
				out_buff[ox++] = (byte) x;
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) (x >>> 16);
			}
			return out_buff;
		}
	}

	// PCM 24 bit, signed, big-endian
	private static class AudioFloatConversion24SB extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = ((in_buff[ix++] & 0xFF) << 16) | ((in_buff[ix++] & 0xFF) << 8) | (in_buff[ix++] & 0xFF);
				if (x > 0x7FFFFF)
					x -= 0x1000000;
				out_buff[ox++] = x * (1.0f / (float) 0x7FFFFF);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * (float) 0x7FFFFF);
				if (x < 0)
					x += 0x1000000;
				out_buff[ox++] = (byte) (x >>> 16);
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) x;
			}
			return out_buff;
		}
	}

	// PCM 24 bit, unsigned, little-endian
	private static class AudioFloatConversion24UL extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = (in_buff[ix++] & 0xFF) | ((in_buff[ix++] & 0xFF) << 8) | ((in_buff[ix++] & 0xFF) << 16);
				x -= 0x7FFFFF;
				out_buff[ox++] = x * (1.0f / (float) 0x7FFFFF);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * (float) 0x7FFFFF);
				x += 0x7FFFFF;
				out_buff[ox++] = (byte) x;
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) (x >>> 16);
			}
			return out_buff;
		}
	}

	// PCM 24 bit, unsigned, big-endian
	private static class AudioFloatConversion24UB extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = ((in_buff[ix++] & 0xFF) << 16) | ((in_buff[ix++] & 0xFF) << 8) | (in_buff[ix++] & 0xFF);
				x -= 0x7FFFFF;
				out_buff[ox++] = x * (1.0f / (float) 0x7FFFFF);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * (float) 0x7FFFFF);
				x += 0x7FFFFF;
				out_buff[ox++] = (byte) (x >>> 16);
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) x;
			}
			return out_buff;
		}
	}

	/***************************************************************************
	 * 
	 * 32 bit signed/unsigned, little/big-endian
	 * 
	 **************************************************************************/

	// PCM 32 bit, signed, little-endian
	private static class AudioFloatConversion32SL extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = (in_buff[ix++] & 0xFF) | ((in_buff[ix++] & 0xFF) << 8) | ((in_buff[ix++] & 0xFF) << 16) | ((in_buff[ix++] & 0xFF) << 24);
				out_buff[ox++] = x * (1.0f / (float) 0x7FFFFFFF);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * (float) 0x7FFFFFFF);
				out_buff[ox++] = (byte) x;
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) (x >>> 16);
				out_buff[ox++] = (byte) (x >>> 24);
			}
			return out_buff;
		}
	}

	// PCM 32 bit, signed, big-endian
	private static class AudioFloatConversion32SB extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = ((in_buff[ix++] & 0xFF) << 24) | ((in_buff[ix++] & 0xFF) << 16) | ((in_buff[ix++] & 0xFF) << 8) | (in_buff[ix++] & 0xFF);
				out_buff[ox++] = x * (1.0f / (float) 0x7FFFFFFF);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * (float) 0x7FFFFFFF);
				out_buff[ox++] = (byte) (x >>> 24);
				out_buff[ox++] = (byte) (x >>> 16);
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) x;
			}
			return out_buff;
		}
	}

	// PCM 32 bit, unsigned, little-endian
	private static class AudioFloatConversion32UL extends AudioFloatConverter {
		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = (in_buff[ix++] & 0xFF) | ((in_buff[ix++] & 0xFF) << 8) | ((in_buff[ix++] & 0xFF) << 16) | ((in_buff[ix++] & 0xFF) << 24);
				x -= 0x7FFFFFFF;
				out_buff[ox++] = x * (1.0f / (float) 0x7FFFFFFF);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * (float) 0x7FFFFFFF);
				x += 0x7FFFFFFF;
				out_buff[ox++] = (byte) x;
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) (x >>> 16);
				out_buff[ox++] = (byte) (x >>> 24);
			}
			return out_buff;
		}
	}

	// PCM 32 bit, unsigned, big-endian
	private static class AudioFloatConversion32UB extends AudioFloatConverter {

		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = ((in_buff[ix++] & 0xFF) << 24) | ((in_buff[ix++] & 0xFF) << 16) | ((in_buff[ix++] & 0xFF) << 8) | (in_buff[ix++] & 0xFF);
				x -= 0x7FFFFFFF;
				out_buff[ox++] = x * (1.0f / (float) 0x7FFFFFFF);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * (float) 0x7FFFFFFF);
				x += 0x7FFFFFFF;
				out_buff[ox++] = (byte) (x >>> 24);
				out_buff[ox++] = (byte) (x >>> 16);
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) x;
			}
			return out_buff;
		}
	}

	/***************************************************************************
	 * 
	 * 32+ bit signed/unsigned, little/big-endian
	 * 
	 **************************************************************************/

	// PCM 32+ bit, signed, little-endian
	private static class AudioFloatConversion32xSL extends AudioFloatConverter {

		final int xbytes;

		public AudioFloatConversion32xSL(int xbytes) {
			this.xbytes = xbytes;
		}

		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				ix += xbytes;
				int x = (in_buff[ix++] & 0xFF) | ((in_buff[ix++] & 0xFF) << 8) | ((in_buff[ix++] & 0xFF) << 16) | ((in_buff[ix++] & 0xFF) << 24);
				out_buff[ox++] = x * (1.0f / (float) 0x7FFFFFFF);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * (float) 0x7FFFFFFF);
				for (int j = 0; j < xbytes; j++) {
					out_buff[ox++] = 0;
				}
				out_buff[ox++] = (byte) x;
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) (x >>> 16);
				out_buff[ox++] = (byte) (x >>> 24);
			}
			return out_buff;
		}
	}

	// PCM 32+ bit, signed, big-endian
	private static class AudioFloatConversion32xSB extends AudioFloatConverter {

		final int xbytes;

		public AudioFloatConversion32xSB(int xbytes) {
			this.xbytes = xbytes;
		}

		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = ((in_buff[ix++] & 0xFF) << 24) | ((in_buff[ix++] & 0xFF) << 16) | ((in_buff[ix++] & 0xFF) << 8) | (in_buff[ix++] & 0xFF);
				ix += xbytes;
				out_buff[ox++] = x * (1.0f / (float) 0x7FFFFFFF);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * (float) 0x7FFFFFFF);
				out_buff[ox++] = (byte) (x >>> 24);
				out_buff[ox++] = (byte) (x >>> 16);
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) x;
				for (int j = 0; j < xbytes; j++) {
					out_buff[ox++] = 0;
				}
			}
			return out_buff;
		}
	}

	// PCM 32+ bit, unsigned, little-endian
	private static class AudioFloatConversion32xUL extends AudioFloatConverter {

		final int xbytes;

		public AudioFloatConversion32xUL(int xbytes) {
			this.xbytes = xbytes;
		}

		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				ix += xbytes;
				int x = (in_buff[ix++] & 0xFF) | ((in_buff[ix++] & 0xFF) << 8) | ((in_buff[ix++] & 0xFF) << 16) | ((in_buff[ix++] & 0xFF) << 24);
				x -= 0x7FFFFFFF;
				out_buff[ox++] = x * (1.0f / (float) 0x7FFFFFFF);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * (float) 0x7FFFFFFF);
				x += 0x7FFFFFFF;
				for (int j = 0; j < xbytes; j++) {
					out_buff[ox++] = 0;
				}
				out_buff[ox++] = (byte) x;
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) (x >>> 16);
				out_buff[ox++] = (byte) (x >>> 24);
			}
			return out_buff;
		}
	}

	// PCM 32+ bit, unsigned, big-endian
	private static class AudioFloatConversion32xUB extends AudioFloatConverter {

		final int xbytes;

		public AudioFloatConversion32xUB(int xbytes) {
			this.xbytes = xbytes;
		}

		public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < out_len; i++) {
				int x = ((in_buff[ix++] & 0xFF) << 24) | ((in_buff[ix++] & 0xFF) << 16) | ((in_buff[ix++] & 0xFF) << 8) | (in_buff[ix++] & 0xFF);
				ix += xbytes;
				x -= 2147483647;
				out_buff[ox++] = x * (1.0f / 2147483647.0f);
			}
			return out_buff;
		}

		public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset) {
			int ix = in_offset;
			int ox = out_offset;
			for (int i = 0; i < in_len; i++) {
				int x = (int) (in_buff[ix++] * 2147483647.0);
				x += 2147483647;
				out_buff[ox++] = (byte) (x >>> 24);
				out_buff[ox++] = (byte) (x >>> 16);
				out_buff[ox++] = (byte) (x >>> 8);
				out_buff[ox++] = (byte) x;
				for (int j = 0; j < xbytes; j++) {
					out_buff[ox++] = 0;
				}
			}
			return out_buff;
		}
	}

	public static AudioFloatConverter getConverter(AudioFormat format) {
		AudioFloatConverter conv = null;
		if (format.getFrameSize() == 0)
			return null;
		if (format.getFrameSize() != ((format.getSampleSizeInBits() + 7) / 8) * format.getChannels()) {
			return null;
		}
		if (format.getEncoding().equals(Encoding.PCM_SIGNED)) {
			if (format.isBigEndian()) {
				if (format.getSampleSizeInBits() <= 8) {
					conv = new AudioFloatConversion8S();
				} else if (format.getSampleSizeInBits() > 8 && format.getSampleSizeInBits() <= 16) {
					conv = new AudioFloatConversion16SB();
				} else if (format.getSampleSizeInBits() > 16 && format.getSampleSizeInBits() <= 24) {
					conv = new AudioFloatConversion24SB();
				} else if (format.getSampleSizeInBits() > 24 && format.getSampleSizeInBits() <= 32) {
					conv = new AudioFloatConversion32SB();
				} else if (format.getSampleSizeInBits() > 32) {
					conv = new AudioFloatConversion32xSB(((format.getSampleSizeInBits() + 7) / 8) - 4);
				}
			} else {
				if (format.getSampleSizeInBits() <= 8) {
					conv = new AudioFloatConversion8S();
				} else if (format.getSampleSizeInBits() > 8 && format.getSampleSizeInBits() <= 16) {
					conv = new AudioFloatConversion16SL();
				} else if (format.getSampleSizeInBits() > 16 && format.getSampleSizeInBits() <= 24) {
					conv = new AudioFloatConversion24SL();
				} else if (format.getSampleSizeInBits() > 24 && format.getSampleSizeInBits() <= 32) {
					conv = new AudioFloatConversion32SL();
				} else if (format.getSampleSizeInBits() > 32) {
					conv = new AudioFloatConversion32xSL(((format.getSampleSizeInBits() + 7) / 8) - 4);
				}
			}
		} else if (format.getEncoding().equals(Encoding.PCM_UNSIGNED)) {
			if (format.isBigEndian()) {
				if (format.getSampleSizeInBits() <= 8) {
					conv = new AudioFloatConversion8U();
				} else if (format.getSampleSizeInBits() > 8 && format.getSampleSizeInBits() <= 16) {
					conv = new AudioFloatConversion16UB();
				} else if (format.getSampleSizeInBits() > 16 && format.getSampleSizeInBits() <= 24) {
					conv = new AudioFloatConversion24UB();
				} else if (format.getSampleSizeInBits() > 24 && format.getSampleSizeInBits() <= 32) {
					conv = new AudioFloatConversion32UB();
				} else if (format.getSampleSizeInBits() > 32) {
					conv = new AudioFloatConversion32xUB(((format.getSampleSizeInBits() + 7) / 8) - 4);
				}
			} else {
				if (format.getSampleSizeInBits() <= 8) {
					conv = new AudioFloatConversion8U();
				} else if (format.getSampleSizeInBits() > 8 && format.getSampleSizeInBits() <= 16) {
					conv = new AudioFloatConversion16UL();
				} else if (format.getSampleSizeInBits() > 16 && format.getSampleSizeInBits() <= 24) {
					conv = new AudioFloatConversion24UL();
				} else if (format.getSampleSizeInBits() > 24 && format.getSampleSizeInBits() <= 32) {
					conv = new AudioFloatConversion32UL();
				} else if (format.getSampleSizeInBits() > 32) {
					conv = new AudioFloatConversion32xUL(((format.getSampleSizeInBits() + 7) / 8) - 4);
				}
			}
		} else if (format.getEncoding().equals(PCM_FLOAT)) {
			if (format.getSampleSizeInBits() == 32) {
				if (format.isBigEndian())
					conv = new AudioFloatConversion32B();
				else
					conv = new AudioFloatConversion32L();
			} else if (format.getSampleSizeInBits() == 64) {
				if (format.isBigEndian())
					conv = new AudioFloatConversion64B();
				else
					conv = new AudioFloatConversion64L();
			}

		}

		if ((format.getEncoding().equals(Encoding.PCM_SIGNED) || format.getEncoding().equals(Encoding.PCM_UNSIGNED)) && (format.getSampleSizeInBits() % 8 != 0)) {
			conv = new AudioFloatLSBFilter(conv, format);
		}

		if (conv != null)
			conv.format = format;
		return conv;
	}

	private AudioFormat format;

	public AudioFormat getFormat() {
		return format;
	}

	public abstract float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_offset, int out_len);

	public float[] toFloatArray(byte[] in_buff, float[] out_buff, int out_offset, int out_len) {
		return toFloatArray(in_buff, 0, out_buff, out_offset, out_len);
	}

	public float[] toFloatArray(byte[] in_buff, int in_offset, float[] out_buff, int out_len) {
		return toFloatArray(in_buff, in_offset, out_buff, 0, out_len);
	}

	public float[] toFloatArray(byte[] in_buff, float[] out_buff, int out_len) {
		return toFloatArray(in_buff, 0, out_buff, 0, out_len);
	}

	public float[] toFloatArray(byte[] in_buff, float[] out_buff) {
		return toFloatArray(in_buff, 0, out_buff, 0, out_buff.length);
	}

	public abstract byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff, int out_offset);

	public byte[] toByteArray(float[] in_buff, int in_len, byte[] out_buff, int out_offset) {
		return toByteArray(in_buff, 0, in_len, out_buff, out_offset);
	}

	public byte[] toByteArray(float[] in_buff, int in_offset, int in_len, byte[] out_buff) {
		return toByteArray(in_buff, in_offset, in_len, out_buff, 0);
	}

	public byte[] toByteArray(float[] in_buff, int in_len, byte[] out_buff) {
		return toByteArray(in_buff, 0, in_len, out_buff, 0);
	}

	public byte[] toByteArray(float[] in_buff, byte[] out_buff) {
		return toByteArray(in_buff, 0, in_buff.length, out_buff, 0);
	}
}
